Caddie, It's really tough, and unless you live it, do don't know how you will react. I know my mum fell apart with her result sheet when she thought that she had breast cancer. (She was fine, but was still $hit scared waiting for the results.)
I dont need to sound rude, but your hubby needs a kick square up the bottom. It's not a 'mood' it's genuine fear, and he needs to comfort you, give you lots of cuddles and reassuring words, as it is frightening for you.
I have every faith that you will be fine, and will say a prayer for you.
If you have a close friend to confide in, it might be a good idea. Otherwise keep posting here as a way to talk about your feelings with people that will be supportive and offer non judgemental advice.